That Jīva (soul), which, after dying in an Amanaska species (which is not endowed with mental faculty), has taken reincarnation in the Samanaska species (which is endowed with mental faculty);
such Jīva (living being), which has the potentiality of mental development but has not developed it due to lack of developed brain; it does not have the potentiality of remembering the good or evil indulged in or enmity etc. which existed in the past life.
ye tvasaṃjñibhyaste'saṃjñibhūtāḥ, asaṃjñinaśca pāścātyaṃ na kimapi janmāntarakṛtaṃ śubhamaśubhaṃ vairādikaṃ vā smaranti.
(Prajñā 17.9 Vṛ Pa 557,558)